Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities Available-For-Sale) (Details) $ in Millions	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	$ 53,862	$ 59,813
Less than 12 months Gross Unrealized Loss	$ 3,675	$ 4,274
Total number of securities in an unrealized loss position less than 12 months	6,766	7,220
Equal to or Greater than 12 Months Estimated Fair Value	$ 118,088	$ 119,976
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 25,317	$ 26,877
Total number of securities in an unrealized loss position equal or greater than 12 months	10,128	10,468
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	$ 15,654	$ 17,222
Less than 12 months Gross Unrealized Loss	1,413	1,586
Equal to or Greater than 12 Months Estimated Fair Value	36,179	35,940
Equal to or Greater than 12 Months Gross Unrealized Loss	6,139	6,599
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	9,410	10,516
Less than 12 months Gross Unrealized Loss	604	709
Equal to or Greater than 12 Months Estimated Fair Value	24,220	24,454
Equal to or Greater than 12 Months Gross Unrealized Loss	5,226	5,625
Foreign government
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	7,536	6,462
Less than 12 months Gross Unrealized Loss	680	581
Equal to or Greater than 12 Months Estimated Fair Value	16,082	16,338
Equal to or Greater than 12 Months Gross Unrealized Loss	5,149	4,740
RMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	7,230	10,152
Less than 12 months Gross Unrealized Loss	220	358
Equal to or Greater than 12 Months Estimated Fair Value	13,788	13,922
Equal to or Greater than 12 Months Gross Unrealized Loss	2,248	2,619
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	5,446	9,337
Less than 12 months Gross Unrealized Loss	426	687
Equal to or Greater than 12 Months Estimated Fair Value	14,048	14,082
Equal to or Greater than 12 Months Gross Unrealized Loss	4,523	5,027
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	5,567	2,840
Less than 12 months Gross Unrealized Loss	89	88
Equal to or Greater than 12 Months Estimated Fair Value	4,735	5,831
Equal to or Greater than 12 Months Gross Unrealized Loss	380	436
Municipals
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	1,617	2,012
Less than 12 months Gross Unrealized Loss	205	226
Equal to or Greater than 12 Months Estimated Fair Value	4,585	4,621
Equal to or Greater than 12 Months Gross Unrealized Loss	1,189	1,272
CMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	1,402	1,272
Less than 12 months Gross Unrealized Loss	38	39
Equal to or Greater than 12 Months Estimated Fair Value	4,451	4,788
Equal to or Greater than 12 Months Gross Unrealized Loss	463	559
Investment Grade
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	50,168	56,946
Less than 12 months Gross Unrealized Loss	3,525	4,132
Equal to or Greater than 12 Months Estimated Fair Value	114,273	116,072
Equal to or Greater than 12 Months Gross Unrealized Loss	24,841	26,325
Below Investment Grade
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	3,694	2,867
Less than 12 months Gross Unrealized Loss	150	142
Equal to or Greater than 12 Months Estimated Fair Value	3,815	3,904
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 476	$ 552